Originally recorded as a sound effect for the film Distant Drums in 1951 and named after the character who yelped it out, this distinctive scream was archived in the Warner Brothers sound effects library, and was subsequently used in countless films, first simply as a generic stock scream, and later because sound supervisors and directors used it in their films (including Star Wars, Indiana Jones, Toy storey and Pirates of the Caribbean) as a sort of touchstone or homage to earlier films. Though no specific documentation lists the identity of the screamer, sound designer Ben Burtt's research of Warner Brother's recording logs indicates that singer/actor Sheb Wooley is likely the source, as he was one of the bit actors contracted to record sound effects for Distant Drums, and had been known to specialise in yells, laughs, and screams. On the web: Hollywood Lost And Found's History Of The Wilhelm Scream